[PATCH] D12512: [libcxxabi] Manually align pointers in __cxa_allocate_exception - Fixes PR24604

[Eric Fiselier via cfe-commits]

EricWF created this revision.
EricWF added reviewers: mclow.lists, danalbert, compnerd, majnemer.
EricWF added a subscriber: cfe-commits.

In 32 bit builds the __cxa_exception class has an alignment requirement greater than the maximal alignment supported by malloc. If this is the case we need to manually align the pointers returned from malloc in ordered to prevent undefined behavior. This patch does exactly that.

See PR24604 for more information - https://llvm.org/bugs/show_bug.cgi?id=24604

http://reviews.llvm.org/D12512

Files:
  src/cxa_exception.cpp
  test/test_cxa_allocate_exception.pass.cpp

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